When the folklore of Russia first became accessible to scholars, the adherents of the mythological theory of the origin of popular tales and songs, which had been enunciated by Grimm, set out at once to expound the epic songs and fairy tales as purely mythical symbols of a pre-Christian era. It was assumed that the songs and stories had come down to us in an almost unchanged text from the most remote antiquity, and that they were the representatives of a distinctly Russian conception. In the meantime, Benfey and his followers have pointed out that the fairy tales of Europe are traceable to their Indian home, whence they have wandered to the most remote regions, crossing and recrossing each other, and mingling in a variety of ways. Even the casual song that bears every appearance of native origin is frequently identical with similar songs in distant quarters; so, for example, Professor Child has brought together a vast number of similar motives from the whole world in his monumental work on the English and Scotch Ballads. Under the stress of these discoveries, the greater part of the mythological ballast had to be thrown overboard, and Russian folklore was brought into direct relations with the rest of the world. It has been a rude disappointment to those who believed in an autochthonous development of the bylínas, to discover that they are often variations of similar accounts in foreign literatures; that, for example, the story of Sadkó the Merchant has been found to be identical with a French story; similarly, the ceremonial songs are not all of native growth. The study of comparative literature is of recent development, at least so far as Russian sources are concerned, and only a small part of the material has been properly located; but this much can even now be asserted,--that the folklore of Russia is much more intimately connected with that of Europe and Asia than is the written literature of the old period. Much of the apocryphal matter came through the South Slavic countries; many stories and songs must have wandered by way of Poland to White-Russia, and hence farther into the interior. Anciently there could have been an interchange of motives between Germany and Russia in the cities of Nóvgorod and Pskov, which stood in commercial relations with the towns of the Hansa, while earlier the Northern saga may have left some traces during the domination of the Norse. But one of the investigators, Stásov, and after him Potánin, have stoutly maintained that most of the stories of the Russian epic cycle came with the Tartars directly from Asia.